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For what value of n does …

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For what value of n does the two ap's have same value 13,19,25,....&69,68,67,....

Posted by Pups Vengiliganapalli 6 years, 1 month ago

CBSE > Class 10 > Mathematics

4 answers

Anshul Kumar Parira 6 years, 1 month ago

For 1st AP a=13 d=19-13=6 For 2nd AP A=69 D=68-69=-1 an =An a+(n-1)d=A+(n-1)D 13+(n-1)6=69+(n-1)-1 13+6n-6=69-n+1 7 +6n=70-n 6n+n=70-7 7n=63 n=9

Adarsh Mp 6 years, 1 month ago

9 is the right answer

Pups Vengiliganapalli 6 years, 1 month ago

a1=13 d1=6 a2=69 d2=-1 13+(n-1)6=69+(n-1)-1 13+6n-6=69-n+1 7+6n=70-n 7n=63 n=9

Pups Vengiliganapalli 6 years, 1 month ago

,

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Posted by Kanika . 4 months, 2 weeks ago

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